<template>
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      <a-timeline-item>学习 HTML + CSS 2017-05-01</a-timeline-item>
      <a-timeline-item color="green">
        学习 JavaScript 2017-07-01
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      <a-timeline-item>
        <a-icon slot="dot" type="clock-circle-o" style="font-size: 16px;" />
        学习 PHP 2017-09-01
      </a-timeline-item>
      <a-timeline-item color="red">
        学习 vue 2017-10-01
      </a-timeline-item>
      <a-timeline-item>学习 node.js 2017-11-01</a-timeline-item>
      <a-timeline-item>
        <a-icon slot="dot" type="clock-circle-o" style="font-size: 16px;" />
        学习数据结构 2017-12-01
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